The presence of 17 polycyclic aromatic hydrocarbons (PAHs) and 15 persistent organochlorine pesticides (OCPs) in surface water of the Yongding River Basin was analyzed through GC/MS/MS during the spring and summer at 46 sampling sites. The goal was to investigate their seasonal distribution, possible sources, and potential risk. Our results showed that the total PAH concentration in surface water of Yongding River Basin ranged from 41.60 to 1482.60 ng/L with a mean value of 137.85 ng/L in the spring, and from 53.53 to 506.53 ng/L with a mean value of 124.43 ng/L in the summer. The total OCP concentration ranged from < 0.08 to 197.71 ng/L with a mean value of 7.69 ng/L in the spring, and from < 0.08 to 93.58 ng/L with a mean value of 7.92 ng/L in the summer. Moreover, the total PAH concentration was slightly lower in the spring than in the summer, whereas the total OCP concentration was similar between seasons. Source analysis indicated that combustion sources and petroleum sources both contributed to the presence of PAHs. Historical environmental residues and long range atmospheric transport were the major sources of HCH and DDT contamination. The concentrations of total PAHs and single PAHs including benz(a)anthracene, benzo(a)pyrene, benz(b)fluoranthene, and benz(k)fluoranthene in surface water at some sampling sites exceeded the water environmental quality standards of China and several other countries or organizations. This indicated a potential threat to human health from the consumption of aquatic organisms due to PAH bioaccumulation. The concentrations of α-HCH, p,p’-DDE, and p,p’-DDD at several sampling sites exceeded the limit for human health specified in the ambient water quality criteria developed by the US Environmental Protection Agency, which indicated that these pollutants provide potential hazards to the residents around the sampling sites.

通过GC / MS / MS在春季和夏季的46个采样点分析了永定河流域地表水中17种多环芳烃（PAHs）和15种持久性有机氯农药（OCPs）的存在。目的是调查其季节性分布，可能的来源和潜在风险。结果表明，永定河流域地表水中的多环芳烃总浓度在春季的平均值为41.60至1482.60 ng / L，平均值为137.85 ng / L，春季的平均值为53.53至506.53 ng / L，平均值为124.43。夏季ng / L。OCP的总浓度在春季时为<0.08至197.71 ng / L，平均值为7.69 ng / L，在夏季为<0.08至93.58 ng / L，平均值为7.92 ng / L。而且，春季的总PAH浓度比夏季略低，而各季节的OCP浓度相似。来源分析表明，燃烧源和石油源均促成了多环芳烃的存在。历史环境残留物和远距离大气迁移是六氯环己烷和滴滴涕污染的主要来源。在某些采样点，地表水中总多环芳烃和单一多环芳烃的浓度超过了某些国家的水环境质量标准，其中包括苯并（a）蒽，苯并（a）py，苯并（b）荧蒽和苯并（k）荧蒽。其他国家或组织。这表明由于PAH生物蓄积，食用水生生物可能对人类健康构成威胁。浓度 而各季节的总OCP浓度相似。来源分析表明，燃烧源和石油源均促成了多环芳烃的存在。历史环境残留物和远距离大气迁移是六氯环己烷和滴滴涕污染的主要来源。在某些采样点，地表水中总多环芳烃和单一多环芳烃的浓度超过了某些国家的水环境质量标准，其中包括苯并（a）蒽，苯并（a）py，苯并（b）荧蒽和苯并（k）荧蒽。其他国家或组织。这表明由于PAH生物蓄积，食用水生生物可能对人类健康构成威胁。浓度 而各季节的总OCP浓度相似。来源分析表明，燃烧源和石油源均促成了多环芳烃的存在。历史环境残留物和远距离大气迁移是六氯环己烷和滴滴涕污染的主要来源。在某些采样点，地表水中总多环芳烃和单一多环芳烃的浓度超过了某些国家的水环境质量标准，其中包括苯并（a）蒽，苯并（a）py，苯并（b）荧蒽和苯并（k）荧蒽。其他国家或组织。这表明由于PAH生物蓄积，食用水生生物可能对人类健康构成威胁。浓度 来源分析表明，燃烧源和石油源均促成了多环芳烃的存在。历史环境残留物和远距离大气迁移是六氯环己烷和滴滴涕污染的主要来源。在某些采样点，地表水中总多环芳烃和单一多环芳烃的浓度超过了某些国家的水环境质量标准，其中包括苯并（a）蒽，苯并（a）py，苯并（b）荧蒽和苯并（k）荧蒽。其他国家或组织。这表明由于PAH生物蓄积，食用水生生物可能对人类健康构成威胁。浓度 来源分析表明，燃烧源和石油源均促成了多环芳烃的存在。历史环境残留物和远距离大气迁移是六氯环己烷和滴滴涕污染的主要来源。在某些采样点，地表水中总多环芳烃和单一多环芳烃的浓度超过了某些国家的水环境质量标准，其中包括苯并（a）蒽，苯并（a）py，苯并（b）荧蒽和苯并（k）荧蒽。其他国家或组织。这表明由于PAH生物蓄积，食用水生生物可能对人类健康构成威胁。浓度 在某些采样点，地表水中总多环芳烃和单一多环芳烃的浓度超过了某些国家的水环境质量标准，其中包括苯并（a）蒽，苯并（a）py，苯并（b）荧蒽和苯并（k）荧蒽。其他国家或组织。这表明由于PAH生物蓄积，食用水生生物可能对人类健康构成威胁。浓度 在某些采样点，地表水中总多环芳烃和单一多环芳烃的浓度超过了某些国家的水环境质量标准，其中包括苯并（a）蒽，苯并（a）py，苯并（b）荧蒽和苯并（k）荧蒽。其他国家或组织。这表明由于PAH生物蓄积，食用水生生物可能对人类健康构成威胁。浓度在几个采样点，α-六氯环己烷，p， p'-DDE和p， p'- DDD超过了美国环境保护署制定的环境水质标准中规定的人类健康限值，表明这些污染物提供了潜在的危害。对采样地点周围居民的危害。